McIntosh MC303
McIntosh MC303 power amplifier, recognisable by its thick glass front panel and three VU meters, fitted with Power Guard and Sentry Monitor circuits.
Description
The McIntosh MC303 is a power amplifier designed to complement a demanding hi-fi system or home cinema setup. It stands out immediately thanks to its thick glass front panel, machined and anodised aluminium handles, and its highly polished stainless steel chassis, all of which reflect the care taken in the construction of this unit.
Two internal circuits define the operation of the MC303. The Power Guard circuit acts on sound quality by optimising the amplifier's behaviour. The Sentry Monitor circuit, meanwhile, provides a protection function by continuously monitoring for any short circuits, overheating or the presence of direct current, thereby safeguarding the amplifier and its associated speakers.
Three VU meters occupy the front panel and indicate in real time the output power delivered by the unit. Their illumination can be switched off, a feature designed for home cinema setups where the light from the VU meters can interfere with viewing.
This type of power amplifier is aimed at a user already equipped with a preamplifier or home cinema processor, seeking a robust and well-built power stage to drive their speakers. The presence of VU meters that can be switched off makes it a sound choice for both attentive stereo listening and home cinema installations.
Technical specifications
| Configuration | 3 channels |
| Frequency response | +0, -0.25 dB from 20 Hz to 20 kHz; +0, -3 dB from 10 Hz to 100 kHz |
| Bandwidth | 20 Hz to 20 kHz |
| Impedance | 2, 4 or 8 ohms |
| Power | 300 W |
| Signal to noise ratio | 112 dB |
| Total harmonic distortion | 0.005 % |
| Damping factor | >40 |
| Weight | 70.3 kg |
What to check before buying used
On this power amplifier, the thick glass front panel deserves close inspection: an impact during transport can cause a chip or crack that is difficult to see in photos. The three VU meters should respond correctly when powered on, with no stuck needles or faulty lighting. It is also worth checking that the Sentry Monitor circuit does not trigger unwanted protection shutdowns, which could indicate ageing internal components, and that the stainless steel chassis shows no signs of scratches or oxidation.
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